GAT-X131 Calamity Gundam is one of the three Second Generation GAT-X series mobile suits developed by the Earth Federation. The Gundam was assigned to one of the Boosted Men/Biological CPU, Orga Sabnak to use against ORB's forces and the rogue Archangel. Unlike the other two Gundams, the Calamity does not have atmospheric flight capabilities, relying on the Raider as a transport. Based on the Buster Gundam it is the most heavily armed of the three, boasting an array of heavy-duty beam cannons which include a pair of shoulder-mounted ones, on its chest and its shield, along with a shell-based bazooka.